Water-tube boiler.



D. S. JACOBUS.

WATER TUBE BUILER.

APPLICATION FILED MAR-10.19I4.

1 1 62,065. Patented Nov. 30, 191.5.

2 SHEETS-SHEET l- WITNESSES;

AMI/EN TOR W 13" ATTORNEY .r

D. S. JACOBUS.

WATER TUB BOILER.

APPLICATION FILED MAR. H). mm.

1,162,065. Patented Nov. 30, 1915.

2 SHEETS-SHEET 2;

WITNESSES:

MIA/V NTi/fgul UNITED STATES PATENT OFFICE.

DAVID S. JACOBUS, 0F JERSEY CITY, NEW JERSEY, ASSIGNOB TO THE BAZBCOCK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

WATER-TUBE BOILER.

Specification of Letters Patent.

Patented Nov. 30, 1915.

To all whom it may concern:

Be it known that I, DAVID S. JACOBUS, a citizen of the United States, residing at Jersey City, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Water Tube Boilers, of which the following is a specification.

My invention relates to water tube boilers andhas'for its object an increase in the efficiency and capacity in installations of large units. This is effected through a furnace arrangement in which exceptionally high efficiencies are obtained combined with a boiler for economically removing the heat generated in burning the fuel. In certain somewhat similar boilers which have been constructed, where there are three upper steam and water drums and two lower mud drums, there is a limitation to the amount of heating surface which may be installed especially in designs contemplating the use of straight boiler tubes.

The present invention overcomes this difficulty and allows for the introduction of any amount of surface that could be desired to meet practical demands. The construction further admits of the introduction of dust pockets for collecting the dust at points where it will not interfere with the passage of the gases through the boiler, which, in itself, is a material advantage.

The present design com rises four banks of generating tubes and t ree upper steam and water drums into which the tubes are expanded, and headers into which the lower ends of the tubes are expanded. The drums are interconnected by steam and water circulators, and the headers are continuous or in sections and nippled together. This arrangement allows the use of either straight tubes or tubes curved at their upper ends and straight throughout the rest of their length, and permits any desired amount of generating surface within the range of reasonable ractice to be installed per foot of width 0 the boiler.

The invention will be understood by reference to the accompanying drawings in which- Fighre 1 is a longitudinal section of a boiler showing one embodiment of the invention; and ig. 2 is a similar view showing a modified arrangement of some of the parts.

Similar reference numerals indicate similar parts in the several views.

In the desi n of Fig. 1 are shown two inner banks 0 water tubes 1 and 2 inclined toward each other and expanded at their upper ends into a central steam and water drum 3, and at their lower ends into headers 4 and 5,said headers extending from one side wall of the setting to the other side wall, one set on each side of the furnace. Inclined to the vertical, at a less degree than the degree of inclination of the banks 1 and 2, are two outer banks 6 and 7, the tubes of which are expanded at their upper ends into outer transverse steam and water drums 8 and 9 placed one on each side of the central steam and water drum and parallel therewith, and their lower ends expanded into headers 10 and 11. The headers 4 and 10 are connected by nipples 12, and headers 5 and 11 are connected by nipples 13. Spaces between the nipples permit the dust to fall through into pockets as later described. The central steam and water drum is interconnected with the outer steam and water drums by steam circulators 14 and 15, and by water circulators 16 and 17. A covering of fire brick prevents the gases passing above the water circulators.

Baiiles 18 and 19 are placed at the rear of the inner banks of tubes and extend upward from the headers 4 and 5 so as to direct the hot gases from the furnace to the upper part of the two banks, except where it is desired to secure a higher furnace temperature than would be secured by exposing all of the tubes of the inner banks to the fire, in which case the baiiies 18 and 19 are placed between two rows of tubes so as to expose only a portion of the tubes of each of the inner banks to the fire, as indicated in Fig. 2. The gases then flow downward and are guided to the lower part of the outer banks of baflies 20 and 21 resting on the front row of tubes of'the outer banks and extending downward from the outer steam and Water drums 8 and 9. After entering the lower part of the outer banks of tubes the gases are made to cross and recross the same 22, as indicated by the arrows, and finally by cross baflies 22 and to pass to the stack connections through the damper openings 23 and 24. The first rows of tubes of the banks 6 and 7 may be given a greater curvature at their upper ends than is given the-other tubesof said banks. In this design the water and steam circulates upward through the tubes of the inner banks and the water from drum 3 fiows into drums S and 9 through the circulators l6 and 17, 1 thence downward through the tubes of the outer banks 6 and 7, and through the headers 10 and 11, and connecting nipples 12 and 13 into the headers l and 5, from whence it again flows upward through the tubes of m'the inner banks. The steam generated by the boiler passes from the drums 8 and 9 through pipes 25 and 26 to two superheaters 27 and 28 placed in the spaces between the two banks of generating tubes, the steam being thus divided between the two superheaters and finally discharged therefrom into the mains. The superheaters 27 and 28 may be of any approved design, that shown consisting of U-shaped tubes extending substantially parallel with the tubes of the inner banks with their ends expanded into cross boxes. The superheaters may be 0mitted if saturated steam only is required.

Dust boxes 29 and 30 are proyided below 80 the headers into which dust will collect after passing through the spaces between the nipples l2 and 13, and from which it may be readily withdrawn through suitable doors 31 and 32, or in any other convenient man- 85 ner.

In the design shown in Fig. 2 a greater number of tubes are shown in the inner banks than are shown in Fig. 1, and the headers 33 and 34 are made continuous instead of in sections nippledtogether. I also introduce additional rows of tubes 35 and 36 extending from the central steam and water drum to the outer banks of tubes, which tubes 35 and 36 support battles 37 and 38 extending from drum 3 to bafiles 21 and 22, respectively. In this case alternate tubes of the front rows of the outer banks are omitted, their places being taken by the tubes 35 and 36. Also'as indicated in this figure, the

bafiles 18 and 19 are placed between two rows of tubes so as to expose only a portion of the tubes of each of the inner banks of the fire; securing thereby a higher furnace temperature than could be obtained by exposing all of the tubes to the fire.

The tubes in all of the banks in both of the above described designs may be readily removed, as indicated by the broken lines, by passing them downward through hand 99 hole openings in the headers, and the new tubes may be inserted bypassing them upward through said openings. An advantage derived in the construction shown is that it is not necessary to allow for the removal of the tubes by leaving enough space between the tubes for passing them in and out.

In the ordinary use of straight tubes connected at both ends to drums, it is necessary to allow for removal and replacement of To any one of the tubes without removing the others, and to do this enough space is left between the tubes, and the spacing and the form of the projections on the drums are so arranged that after cutting out an old tube a new one can be inserted in its place.

In inserting the new tube one end of it is passed through the opening in one of the drums and it is then moved over the opening in the other drum and made to enter the latter, after which it is expanded into place. To accomplish this requires a much wider spacing of the tubes than is required in boilers of the present design where the tubes are replaced by passing them upward 8 through the hand hole openings in the head ers into which their lower ends are expanded.

The hand hole fittings provided for the removal and replacement of tubes in the headers need be removed only for replacing tubes, as it is not necessary to remove such fittings in cleaning the tubes by means of the standard turbine tube cleaners, which are inserted from the top of the tubes by a man Within the upper steam and water drums. This removes an objection often raised to the use of a number of such hand hole fittings. By using tubes straight throughout their length except for a short part at their upper ends, they can be readily inspected to make certain that all of the scale is removed after a cleaner has been used. Again with such tubes in the inner banks there is no danger of sediment lodging near the lower ends as there is in the case of tubes curved at their lower ends. \Vhere sediment lodges in a tube exposed to the radiant heat of the fire there is danger of blistering, and the use of such tubes, as shown, leads to an advantage in this respect.

The banks of tubes in both of the designs above described are suspended over a common furnace 39 extending from the front to the rear of the boiler, the inner banks so disposed as to converge toward each other upwardly, their upper ends meetin approximately in the transverse central p ane of the setting. There is thus provided a large A- shaped combustion chamber substantially closed at the apex and open to the gases along the upper part of the inclined sides; that is, at the uptake ends of the generating tubes of the inner banks. The gases divide and pass over the heating surfaces, as indicated by the arrows, and as previously described.

The furnace may be of any approved type with means for charging it preferably at the front and rear, so as to provide a substantially continuous fuel bed beneath the boiler. With such arran ement the character of the combustion may be maintained substantially constant from one side of'the boiler. to the other, and the loss often experienced through a stream or lane of excess air orunconsumed combustible gases passing through the boiler and escaping to the stacks will be avoided. It is well known among engineers that in ordinary boiler furnaces there is a great variation in analyses taken from different points in the path of the flow of gases leaving the furnace, whereas with the present furnace arrangement this action is reduced to a minimum, as any irregularity from the front to the rear of the grates disappears before the gases pass from the upper part of the combustion chamber, and, as the composition of the gases for uniform firing conditions will be substantially uniform from one side of the boiler to the other, it follows that the composition of the entire volume of the gases leaving the furnace will be substantially uniform.

What I claim and desire to secure by Letters Patent of the United States is 1. In a water tube boiler, two inner banks of generating tubes inclined toward each other so as to form two sides of an A-shaped combustion chamber, a steam and water drum into which the upper ends of the tubes of both of said banks are expanded, headers into which the lower ends of said tubes are expanded, two outer banks of tubes one on each side of the inner banks, steam and water drums and headers into which the tubes of the outer blanks are expanded, and steam and water circulators connecting the intermediate steam and water drum with the outer steam and water drums 2. In a water tube boiler, two inner banks of generating tubes inclined toward each other so as to form two sides of an A-shaped V combustion chamber, a steam and water drum into which the upper ends ofthe tubes of both of said banks are expanded, headers into which the lower ends of said tubes are expanded, two outer banks of tubes one on each side of the inner banks, steam andwater drums and headers into which the tubes of the outer banks are expanded, steam and water circulators connecting the intermediate steam and water drum with the outer steam and water drums, and bafiies to convey the hot gases to the upper portions of the inner banks of tubes, thence downward to the lower part ofthe outer banks,-

and thence upward over the tubes to the outer banks.

3. In a water tube boiler, two inner banks of generating tubes inclined toward each other so as to form two sides of an A-shaped combustion chamber, a steam and water drum into which the upper ends of the tubes of both of said banks are expanded, headers .hot gases to the into which the lower ends of said tubes are expanded, two outer banks of tubes one on each side of the inner banks, steam and water drums and headers into which the tubes of the outer banks are expanded, steam and water circulators connecting the intermediate steam and. water drum with the outer steam and water drums, a centrally disposed fuel chamber common to said banks of tubes, bafiles to direct the hot gases to the upper portions of the inner banks of tubes, thence downward to the lower part of the outer banks, and thence upward over the tubes of the outer banks, and walls forming dust pockets below the headers for collecting any dust which may collect below them 4. In a water tube boiler, two inner banks of generating tubes inclined toward each other so as to form two sides of an A-shaped combustion chamber, a steam and water drum into which the upper ends of the tubes of both of said banks are expanded, headers into which the lower ends of said tubes are expanded, two outer banks of tubes one on each side of the inner banks, steam and water drums and headers into which the tubes of the outer banks are expanded, steam and water circulators connecting the intermediate steam and water drum with the outer steam and water drums, bafiies to direct the hot gases to the upper portions of the inner banks of tubes, thence downward to the lower part of the outer banks, and thence upward over the tubes of thg outer banks, superheaters in the spaces between the banks of tubes, and pipes connectin thcouter steam and water drums with said superheaters.

5. Ina water tube boiler, two inner banks of generating tubes inclined toward each other so as to form two sides of an A-shaped combustion chamber, a steam and water drum into which the upper ends of the tubes of both of said banks are expanded, headers into which the lower ends of said tubes are expanded, two outer, banks of tubes one on each side of the inner banks, steam and water drums and headers into which the tubes of the outer banks are expanded, steam and water circulators connecting the intermediate steam and water drum with the outer steam and water drums, bafiles extend ing upwardly from the headers to direct the per parts of the inner banks of tubes, afiies extending downwardly from the ,outer steam and water drums to direct the gases to the lower part of the outer banks of tubes, and cross baflies in the outer banks of tubes.

6. In a water tube boiler two inner banks of crating tubes inclined toward each other so as to form two sides of an A-shaped combustion chamber, a steam and water drum into which the upper ends of the tubes of both of said banks are expanded, headers into which the lower ends of said tubes are expanded, two outer banks of tubes one on each side of the inner banks, steam and water drums into which the upper ends of 5 the tubes of the outer banks are expanded and headers into which the lower ends of the tubes of the outer banks are expanded, steam and water circulators connecting the intermediate steam and water drum with the lo outer steam and water drums, and rows of tubes connecting the intermediate steam and Water drum with the headers of the outer banks of tubes.

In testimony whereof I have hereunto signed my name in the presence of two sub- 5 scribing Witnesses.

DAVID S. JACOBUS.

Witnesses:

E. P. TERRY, EDITH CAMP.

Correction in Letters Patent No.1,162,065.

It is hereby certified that in Letters Patent No. 1,162,065, granted November 30, 1915, upon the application of David S. Jacobus, of Jersey City, New Jersey, for an improvement in Witter-Tribe Boilers, an error appears in the printed specification requiring correction as follows: Page 3, line 58, claim 2, for the word to read of)" and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 14th day of December, A. D., 1915.

R. F. WHITEHEAD,

[amen] Acting Commissioner of Patent. 

